I don't rank them, I shoot with them, using each one for the purpose for which it's the best one I have.

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Im pretty much agreeing with this, I use lenses according to need then if there are options at that focal length according to which one is most attractive at that time. Yes some may be better than others but really most modern lenses are good enough.

I guess if I were ranking them based on favorites?
1. I love shooting the manual Canon 300mm L FD lens - my preferred wildlife lens
2. 12-40mm - This is the goto lens when I'm unsure of what I'm shooting.
3. On the EM1 - my 2nd choice is the 50-200 ... now focus's great! Due to its sharpness, I'm not afraid to combine this with the 1.4x TC
4. 60mm macro - Fantastic little macro lens however, I'm not real fond of the way it switches into 1:1
5. 9-18mm - This is my urban goto lens for architecture.
6. 45mm is my favorite portrait lens. I get enough working distance to make it discreet
7. 12-50...will probably sell because I never use it anymore.
8. 14-42 ... will keep it because we have multiple bodies.
9. 40-150 ... If I need a little reach and don't want to worry about beating it up a little...

1. 75/1.8 - love the sharpness and bokeh.
2. 12-40/2.8 - love the sharpness and versatility.
3. 7-14/4 - great for cities/travel and indoor work.
4. 60/2.8 - love the macro and close focussing ability.
5. 45/1.8 - love the size and great for portraits and head shots.
6. 25/1.4 - like the sharpness, don't like the rattle-snaking.
7. 17/1.8 - good for environmental portraits.

3. Panasonic 35-100mm 2.8 - Fast, small and well built even with lots of internal plastic.

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I notice you have mentioned the plastic in a couple threads lately. Since many of the lenses on your list have plenty of plastic, I'm curious as to why you single this one out? And why the adjective "lots"? Have you disassembled this lens, or seen a cut away? Why do you feel plastic construction is relevant here and not in the other lenses you mention?

Most of the modern lenses including the cheap plastic 14-42 kit zoom as well as the 40-150mm kit zoom are more than good enough to deliver great resolution and great acuity and good IQ. It's a matter of photo composition and technical skills to make good photographers, not the camera body or the lenses themselves.

If you do want to sell your photographs to the highest bidders (if there are any nowadays), then sure go for the best primes or professional zooms. I have personally seen way too many photos created by artistic students that are way better in terms of looks and composition compared to those who have the most expensive lenses and technically advanced bodies. And then you see those with the tech gear copy or plagarise the styles of the people who shoot with less gear and less glass!

My favorite lens, which happens to be Amazon's #1 Best Selling Compact System Lens is the Canon 22mm f2.0 STM EF-M.

For $134.00 brand new it is the bargain of the century, in any system, from FF to M43. Not only sharp (it rivals the legendary O75mm f1.8) but well constructed with a metal outer casing and mounting flange.
This lens alone, has relegated my E-PL5 to never-take-anywhere-anymore status, even with the Sigma 19mm ( my second favorite) on it. The EOS M is no slouch either, in IQ.

Oh, almost forgot. My third favorite lens: Nikon 35mm f1.8 DX AF-S (cheap as dirt, sharp, sharp, sharp. Great on a small DSLR for best all-around carry outfit).

i have a few, but the only one that stands out as worth mentioning is the pl25/1.4
the photos have a special feel to them in my eyes
its like its ALMOST trying to look like my rx1 photos
the other lenses are all great, sharp, etc, but they lack the FEEL of the pl25

My favorites ever are Canon's 35/1.4L and 135/2.0L paired with my 5DII; third place goes to the contax Zeiss 50/1.4, although I'm starting to love the FE 55/1.8 now.

In all honesty, I love MFT as a system, and te standard zoom works best. Considering my love for fast fifties and the 135L, I suspect should just get the pans leica 25 and the Oly 75 (and if the 15 pans leica is good, that). For landscape, though, the 12-35 (and now 12-40) deliver the goods. Honorable mention for the 7-14.

According to my Lightroom analysis, this is my preference list in terms of usage:

1. 9-18
2. 17/1.8
3. 7.5 FE
4. 45/1.8
5. 12-35
6. 75/1.8
7. 100-300

I was surprised about this. I would have put the 75/1.8 much higher, but I guess its ranking represents its somewhat long focal length and my own shooting style to go for wide lenses (I'm mostly a landscape guy).

For the E-M1 I could get by with my 12-40 and 75 1.8, in that order. I haven't used the 45 1.8 since I bought it but I suspect that will change when I get out of the studio and start doing more natural light portraiture. The 40-150 is a specialty lens for me, which I only bought because it was cheap. I don't think I'll use it again.

Ask me again if the Panasonic 42.5mm F1.2 ever ends up in my camera bag, you might get a different answer.

Absolutely love the 75, it's a little soft wide open (which can be very useful) but sharpens up nicely by f2. But mostly it's the perspective, which surprises me a great deal. I've never really shot that effective FL much with any other system I've owned. So not sure why I'm so enamored with it now, but I'm definitely enjoying it, MF and all.

Also have the 14-42 and 45-200 Panasonic zooms, and some other adapted lens. They're useful at times, but I don't have as much fun with them.